1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8e85c4d83dcfed0749c899105072d44fd9d3f99359ff8c8d51e73933e0fb78. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de4559b9-1a6f-4009-a665-940aea0441b2.json and https://artists.proofprofile.net/proofs/artist/de4559b9-1a6f-4009-a665-940aea0441b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17747c72a56d685da7d96d8ea1bfdab1518bf16ab5c7b4bbc416fb1d6b87e7bf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21243951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a20db4b97c050ce90102c5bb718b0858b5bcdd09d5066cf925c429968a5ec7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21243952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6fc5aefa0edae36c0a4945fa9f4b57b2b1fd077880e27418cb35ef1a714d48. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ20929872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ff40874c3945b68e8dede89c2d8d18ef3f1635c53a1382e17849958971d458. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21243953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cfa9e8e82f707f6c26a9a73826c46cae95e8b74cb3caa62fc50a3ed260ff8f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21242381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c57fcc954cd1dd58dfdd883de175b5faee551fbed6b6f0503e67da6fb99fdbe. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21243959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66934942808d8c413e8998940cf0411e52cd175cfe97c9d44b3baed0ad87b2d8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ20608221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f355409f5c56df0c0aef28ad6bfd0df339c72923abd6b1fef8eff32644a2985. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21139302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dded36f4c776d13da8c88ed46eb36db40e59da31b629b3cf5154d71d64c0bf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7643e924c0ce711b9ff7d324cecfa577ec1f84bc47333f0486814867e21053d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe30b67b8b4191d08caac8800b1d4bf110162f9732299185aef40ac45b5125a6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c6243ade8bc941ef42a50fea1428d3b4de5e7ef29793c5d24413d76b294a9f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7423c884da36892e742244fced123cff485b9629762e65574f71b1465b7f0e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae66f0ddd7718eacd92cf525148e098312a25be98f9710b0dad9d88825ae728. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDSL1004208.